Download HF03 / LI19 manual v1215 - Hukseflux - Thermal Sensors

HF03 / LI19
PORTABLE HEAT FLUX SENSOR,
WITH READ-OUT UNIT
USER MANUAL
HF03 / LI19 manual v1215
Edited & Copyright by:
Hukseflux Thermal Sensors
http://www.hukseflux.com
e-mail: [email protected]
Hukseflux Thermal Sensors
Warnings and safety issues:
HF03 / LI19 is NOT certified for EEx
environments.
HF03 is designed for fluxes up to 10
kW/m2. LI19 is suitable for normal
exposure only; up to 2 kW/m2.
Make sure that LI19 is switched off
whenever it is not used.
Make sure to have spare batteries
available whenever using LI19.
Make sure to have read the LI19
manual before using LI19.
LI19 software is not supplied with the
instrument. It should be downloaded
from
http://www.leiderdorpinstruments.nl
HF03 / LI19 manual v1215
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Hukseflux Thermal Sensors
Contents
1
2
3
4
5
6
7
7.1
7.2
List of symbols
Introduction
Specifications of HF03 / LI19
General Theory
Short user guide
Putting HF03 / LI19 into use
Maintenance of HF03
Electrical connection of HF03
Appendices
Appendix on trouble shooting
Allowable levels
HF03 / LI19 manual v1215
4
5
7
8
9
12
13
14
15
15
16
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Hukseflux Thermal Sensors
List of symbols
Heat flux
Voltage output
HF03 sensitivity
HF03 / LI19 manual v1215

W m-2
Vsen V
Esen V/Wm-2
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Hukseflux Thermal Sensors
Introduction
The HF03 is a heat flux sensor that can be used in mobile
applications. It is combined with LI19, a high accuracy hand-held
read-out unit that can be used both for mobile measurements
and as an amplifier directly connected to a PC.
The combination HF03 / LI19 is typically used to study heat flux
levels around flares and fires, and to calibrate flare radiation
monitors / flare heat flux sensors.
The HF03 is a heat flux sensor of the type that is commonly used
in fire testing. The HF03 housing and sensor are designed to be
suitable for short (10 minute) observation of high flux
environments (up to 10 kW/m2). LI19 is suitable for normal
exposure only; up to 2 kW/m2.
LI19 is used to display the measured flux level; for attaining
that, the sensitivity of HF03 is entered into the LI19, by
programming it using a PC. USB connection is part of the
delivery. Software should be downloaded via internet (this is to
ensure that the latest version is applied). The applied site is:
http://www.leiderdorpinstruments.nl.
The LI19 is battery powered, using 2 AA-type batteries. These
are included in the delivery.
Batteries allow 50 days of operation.
HF03 / LI19 is not rated for EEx environments, nevertheless it is
admitted in many cases, because the instrument operates on
3VDC only.
HF03 / LI19 manual v1215
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Hukseflux Thermal Sensors
1
2
8
5 0 .0
3
k W /m 2
4
L I-1 9
9
6
5
10
11
Figure 0.1 LI19 connected to HF03. Heat flux sensor surface
(11), metal heat sink (10), plastic grip (9), polyurethane cable
(7).
Operation:
1 switch on LI19, connect HF03
2 connect LI19 to PC, using USB connection box and LI19
software
3 check sensor settings
4 disconnect from PC
5 optional: mark settings on LI19
6 remove HF03 cap
7 start measurement
8 switch off LI19
Delivery:
HF03 / LI19 / 2 spare batteries / Transport casing / USB
connection box / cap HF03. Software should be downloaded from
http://www.leiderdorpinstruments.nl
HF03 / LI19 manual v1215
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Hukseflux Thermal Sensors
1 Specifications of HF03 / LI19
The HF03 is a heat flux sensor that can be used in mobile
applications. It is combined with LI19, a high accuracy hand-held
read-out unit that can be used both for mobile measurements
and as an amplifier directly connected to a PC. It is supplied with
a transport case.
HF03 / LI19 GENERAL SPECIFICATIONS
Heat flux range for
up to 10 kW/m2
HF03:
Exposure time for
10 minutes (max)
HF03:
Heat flux range for
up to 2 kW/m2
LI19:
Exposure time for
indefinite
LI19:
Cable length:
5m
response time
1 s (nominal value)
Temperature range
-30 to +80 °C
A/D resolution:
1 or 10 µV or 0.1 kW/m2
Software
To be downloaded from
http://www.leiderdorpinstruments.nl
Display functions:
actual values
Weight:
power supply:
Transport casing
Sensor sensitivity
LI19 plus HF03: 1 kg
Including transport casing: 2.5 kg
Transport casing dimensions:
30 x 40 x 12 cm approximately
Two AA-Type batteries, Alkaline
supplied with the instrument
0.1 mV/kW/m2
At 1000 W/m2: 100 μV
At 100 kW/m2: 10 mV
Around 180 degrees
Removable cap
Sensor field of view
Sensor protection
CALIBRATION
Calibration
NIST
traceability
Recalibration interval Every 2 years
Table 1.1 List of HF03 / LI19 specifications
HF03 / LI19 manual v1215
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Hukseflux Thermal Sensors
2 General Theory
The HF03’s main component is a heat flux sensor. The sensor is
located under the black surface on the front of the HF03. It is
mounted on a metal heat sink, which is in turn protected by a
plastic housing. The heat flux sensor generates a small voltage
signal that is a linear function of the incoming radiant and
convective heat flux.
Using HF03 is easy. For readout, one only needs an accurate
voltmeter that works in the millivolt range. To convert the
measured voltage Vsen to a heat flux , the voltage must be
divided by the sensitivity Esen, a constant that is supplied with
each individual sensor.
 = Vsen / Esen
2.1
The sensitivity of HF03 is supplied with each individual
instrument, and can be found on its calibration certificate.
HF03 is read-out by LI19, which essentially is a voltmeter in
which a calibration factor can be entered, to show watt per meter
square.
Expected accuracy:
The expected accuracy of a measurement with HF03 depends on
many factors, but most of all on:
1 the intensity of the radiation
2 wind effects
HF03 is calibrated with a radiant source under conditions of
“natural convection” i.e. no wind.
The wind can play a large role in determining the end result of
the heat flux measurement, and also in discrepancies between
measurement results of one sensor type and another because
surface temperatures on different sensors will deviate from each
other. The quantification of this effect is strongly dependent on
the circumstances. However, deviations of up to 20% have been
reported for different sensor designs, although these were
calibrated under the same conditions.
HF03 / LI19 manual v1215
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Hukseflux Thermal Sensors
3 Short user guide
0 unpack
0.1 in case this is not done before: download software from
http://www.leiderdorpinstruments.nl (products – LI19 – more –
downloads)
0.2 in case this was not done before: take the plastic units strip
and cut off the units that are required. The small strip can be
placed on the LI19 front below that display.
1 switch on LI19, connect HF03
2 connect LI19 to PC, using USB connection box and LI19
software
3 check sensor settings
4 disconnect from PC
5 optional: mark settings on LI19
6 remove HF03 cap
7 start measurement
8 switch off LI19
Figure 3.1 LI19 screen at startup.
Typically the front of the LI19 should have the sensor
information copied (possibly on a sticker).
HF03 / LI19 manual v1215
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Hukseflux Thermal Sensors
Figure 3.2 LI19 connected to the USB connection box.
Installation of the LI19 program will typically be done
automatically by the windows installer. In case older program
versions are present, one might need to uninstall earlier
versions.
If the LI19 program is opened, the LI19 must be connected,
using the USB connection box.
The control untilities will automatically recognise the LI19, and
the window as shown in figure 3.3 will open, giving the message
that the unit is connected.
HF03 / LI19 manual v1215
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Hukseflux Thermal Sensors
Figure 3.3. LI19 software screen.
Press sensor settings:
Figure 3.4 LI19 sensor settings screen.
Press Select Sensor, and select HF03. Select the appropriate
calibration figure for the HF03 that is used. This will be around
95, resulting in a multiplier of 2000 and a divider of around
1900. The LI19 is now ready for use. It is suggested to make a
sticker on the LI19, stating that the calibration is 95.
HF03 / LI19 manual v1215
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Hukseflux Thermal Sensors
4 Putting HF03 / LI19 into use
It is recommended to test if the sensor works, according to the
following table: (estimated time needed: 5 minutes)
Remove cap on the HF03 so that the
black surface of HF03 shows up.
Switch LI19 on. The on/off button is
located on top of the LI19. It needs to
be pressed, to reach a level below the
plastic surface to remain on.
Connect LI19 to a PC, using the USB
connection block. Make contact
through the LI19 software.
Check the sensor settings in the LI19
software against the HF03 calibration
value (see HF03 certificate and sticker
on the sensor). Disconnect the USB
connection block and the PC.
Connect the HF03. + wire is white. The
white wire should be connected to the
red plug, the black wire to the black
plug.
Darken the sensor for instance by
putting the sensor upside down on a
table. The reading should be anywhere
between +50 and -50 W/m2. (reading
proportional to temperature difference
table-sensor, with 50 W/m2 around 10
degrees difference)
Check if the sensor reacts to heat flux.
Expose the sensor to radiation of lamp
on desk or to solar radiation.
Preferably in indoor environment. (no
wind). The reading should reach a
stable value. (direct solar beam
radiation is typically 700 W/m2 on a
clear day; direct plus diffuse max 1300
W/m2, lamp radiation at a level that
feels warm with the hand: around
1000 W/m2)
The program does not
connect to the LI19 if
the LI19 is switched off.
LI9 is now ready for use
HF03 / LI19 is now
ready for use.
The thermopile should
react by generating a
millivolt output signal.
Table 4.1 Checking the functionality of the sensor. The procedure
offers a simple test to get a better feeling how HF03 / LI19
works, and a check if the sensor is OK.
HF03 / LI19 manual v1215
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Hukseflux Thermal Sensors
5 Maintenance of HF03
HF03 and LI19 are virtually maintenance free.
In case this is necessary, HF03 can be cleaned with water or mild
alcohol.
LI19 consumes power. Batteries must be replaced on a regular
basis.
At regular intervals the quality of the cables can be checked.
On a 2 yearly interval the calibration can be checked in an indoor
facility.
Figure 5.1 Battery replacement of LI19.
HF03 / LI19 manual v1215
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Hukseflux Thermal Sensors
6 Electrical connection of HF03
Wire
Colour
Sensor output +
White
Sensor output Black
Shield
steel
Table 6.1 The electrical connection of HF03
Measurement
system LI19
Red connector
Black connector
Not conected
to LI19.
Figure 6.1 Connectors on LI19, and on/off switch.
HF03 / LI19 manual v1215
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Hukseflux Thermal Sensors
7 Appendices
7.1
Appendix on troubleshooting
This paragraph contains information that can be used to make a
diagnosis whenever the sensor does not function.
The sensor
1 check functionality according to table 4.1.
does not give 2 if the sensor does not work: measure sensor
any signal
impedance across the black and white wires,
using a multimeter, in a situation that the sensor
is not exposed to radiation. The value should not
be zero; this indicated a broken circuit. The value
also should not read infinite. Report the
resistance value back to Hukseflux.
2 Check if the sensor reacts to an enforced heat
flux. A 100 Watt lamp mounted at 10 cm distance
should give a definite reaction.
3 Check the data acquisition: apply a mV source
to the LI19 in the 1 mV range.
The sensor
1 Check if the right calibration factor is entered
signal is un- into the algorithm. Please note that each sensor
realistically
has its own individual calibration factor.
high or low. 2 Check the condition of the leads at the logger.
3 Check the cabling condition looking for cable
breaks.
4 Check the data acquisition by applying a mV
source to it in the 1 mV range.
The sensor
1 Check the presence of strong sources of
signal shows electromagnetic radiation (radar, radio etc.)
unexpected
2 Check the condition of the sensor cable.
variations
Table 7.1.1 Troubleshooting for HF03 / LI19
HF03 / LI19 manual v1215
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Hukseflux Thermal Sensors
7.2
Allowable levels
An indication of allowable heat flux levels for personel and
equipment can be found below.
Btu/Hr Ft2
3000
2000
1500
500
Equipment
Human: Run
Human: Walk
Human: Work
(static)
Figure 7.2.1 Allowable heat flux levels
7.3
kW/m2
9.5
6.3
4.7
1.6
Datalogging
LI19 can also be used as a datalogger. In case you need this
capability, the LI19 manual can be obtained from
http://www.leiderdorpinstruments.nl.
HF03 / LI19 manual v1215
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